package com.kylin.add;

import java.util.concurrent.CountDownLatch;

//减法计数器
public class CountDownLatchDemo {

    public static void main(String[] args) throws InterruptedException {
        //总数6
        CountDownLatch countDownLatch = new CountDownLatch(6);

        for (int i = 0; i < 6; i++) {
            new Thread(()->{
                System.out.println(Thread.currentThread().getName()+" Go out");
                countDownLatch.countDown();//-1
            },String.valueOf(i)).start();
        }

        countDownLatch.await();//等待计数器归零，然后再向下执行

        System.out.println("Close Door");
    }
}
